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Seriously -- a number of early (mid- and late-1800s and into the beginning of the 1900s had left-shifting keyframes.

I'm not sure it really made any difference in terms of function. It has long been my impression -- I don't know if it was something I was told years back or if I came up with it on my own -- that the practice ended because of shipping problems. Grands are shipped on their bass (left) side and the action would bounce up and down against the shift return spring sometimes causing damage to various action parts.

Seriously -- a number of early (mid- and late-1800s and into the beginning of the 1900s had left-shifting keyframes.

I'm not sure it really made any difference in terms of function. It has long been my impression -- I don't know if it was something I was told years back or if I came up with it on my own -- that the practice ended because of shipping problems. Grands are shipped on their bass (left) side and the action would bounce up and down against the shift return spring sometimes causing damage to various action parts.